Grinder for irregular surfaces.



A. ROBERTS & A. LIBERT.

GRINDER FOB. IRREGULAR SURFACES.

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3 974,523, I Patented Nov. 1, 1910.

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GRINDER FOB IRREGULAR SUB-PAGES.

APPLICATION FILED PEBJL 1910. 974,523, Patented Nov. 1, 1 910.

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ED STATES PATENT OFFICE.

ROBERTS AND ARTHUR LIBERT, OF GREEN BAY, WISCONSIN.

GIBINDEB FOB IRREGULAR SURFACES.

Specification of Letters Patent.

Patented Nov. 1, 1910'.

Application filed February 14, 1910. Serial No. 548,774.

To all whmn it may Be it known that we, ALEXANDER ROBERTS and ARTHUR LIBERT, citizens of the United States,residing at Green Bay, county of Brown, and State of Wisconsin, have invented new and useful Improvements in Grinders for Irregular Surfaces, of which the following is a s ecification.

Our invention re ates to improvements in that class of grinders, which are adapted to be used for. grinding irregular forms, such a for example, as the curved or angular edges v other irregu of cutting tools or for grindin or polishing l'ar surfaces, an it pertains, more e eclally, among other things, to the device r holding the cutting tool or other article, and for guiding it while being moved in contact with the grinding surface of a ,rapidly revolving emery wheel or other rota grinder.

he construction of our device is further explained by reference to the acdompanying drawings, in which+- Figure 1 represents a front view thereof. Fig. 2'i's aplan view. a Fig. 3 is an end view an Fig, 4 is a detail, part in section, show- .ing a modified form of device for guiding the cutting tool as it is bro ght into moving contact wlth the rotary er n ike parts are identi ed by the same ref- 1 'erence 1numerals throughout the several to said grinder from a views. 7 a

1 represents the grinder or emery wheel,

' which is rigidly supported from the revoluble shaft" 2, and motionis communicated motor not shown,

a through the pulley 3, shaft 4, band pulley 5,

wit

11 represents a'blade to be ground, hav

belt 6, pulley 7, and shaft 2. The grinder'l is preferabl formed with a, hollow center, as shown 1n 1g. 4, comprising the periphery or annulargrinding surface .9 and end member -10, which end member is rigidly aflixed to its sup ortingshaft 2 by clamping nuts 2, where y the end edges of the grinder on] are preferabl brought into contact the surface to ground.

" mg an irre lar cutting edge 12, and the I puma-i y obj toward and ct ofou r invention is to guide the blade 11, so that it will be causedto move from the grinding surface of the emery wheel or other grinder, to conf form to a predetermined shape of the guide plate 13, itbeing understood that the guide plate 13 may be made of wood or other suit? able material of any desired shape, and that it bein revolub y supported 1n stationary bearings such guide plate is so located, that the blade supporting carriage 14 as it is moved forwardly and backwardly past the grinder, will be caused to move laterally whereby the surface of the blade or other article to be ound, will be ound to conform to the s ape of the gui e late. The carriage 14 is s idably sup orte upon the base plate 15 and is retaine in place by the dove tailed flan 16 operating inia dove tailed oove 17 o thecarriage, and the blade 11 is rigidly secured to the supporting bracket 18 of the carriage by clamping bolts' 19, while the guide plate 13', may, as shown in Fig. 4,, be

ad ustably supported from the base 15, such guide late 13 may, if desired, be rigidly secured to the moving carriage 14, as shown inFigs. 1, 2, and 3, and when the guide plate is thus supported from the movin carriage, its edge which is provided wit the irregular form, 1s caused to yieldingly bear against the guide bearing 30 and such guidearm 33. The swmgin arm 33 ispivotally supglinorted at one end in the carriage 14 by t e vertical trunnion 34.

The carriage su porting base plate 15 is s'lidably supporte on, the guide ways 15' and sa1dways'15' are rigidly connected with the main frame 48' of the machine by the y bracket 49. The carriage, and blade are moved forwardly and backwardly by the manual an of the operator, such motion bemg comm nicated tothc carriage through the hand wheel 40 shaft 41, pinion 42, and toothed bar 43, said carriage 14 bein rigidly aflixed to and carried by saidtoot ed bar,

while said carriage sup orting base plate15 and the parts support to the width of the mg wheel accordin ground, by the blade or other artic e to be manual act of the operator,a lateral movement being communicated to said base late I through the crank 45 and threaded sha 46, understood that the shaft46 is of the bracket 49, while its threaded end optherefrom, are ad justed nearer to or fartherfrom the grindios nearer to the grinding ished, may be adjusted with thegrinder',

plate and bearing of the two ways shown and .to bear as itis-swung wa'rdly with theblade to be ground.

. The guide plate 13' and guide bear1ng30.

in Figs. -1,

v 3 plate 13 and'the other parts shown in 55 be ground is moved facelof the grinder.

crates in' a threaded, sleeve carried by the base late 15, whereby as said crank is turne in one direction, the platform 15 and the parts supported therefrom are moved verse movement of said crank, 45, such parts are moved in the opposite direction, whereby blades or other ob ects to be ground or pol- ;in yielding contact while the spring 31 yields sufliciently to permit the object as it is being ground, to move toward and from the grinder to conform to the irregular shape of the guide plate.

15 While the guide plate is' preferably supported from the reciprocatingcarriage, as shown-in Figs. 1, 2 and. 3, and the gu1de bearing 30-is-su ported from the stationary platform, the re ative position of said, guide may be reversed and the guide plate may e supported from the stationary platform and the bearing supported fronrthe reciprocating carriage as shown n Fig. 4:, it being quite nnmatena as to WhlCh described, such cooperating parts are located. v 50' is a sup orting bearing, upon Whlch the free end of the'swin lever 33 is adapted ackwardly and for- I 2 and 3 are referred to m the modified form shown in" Fig. 4 as the guide bearing-30', a the Fig. 4 being constructed and arranged substantially as shown, in the I other three figures of the application.

. Having thus described our mvention, what we claim as new, and desire to secure by Let- 40 ters Patent, is- 1. lnia device of the described class, the

, combination of a revoluble grinder, a carria'ge ada ted to be alternately moved in oppositedirections past and in close proxim tosaid grinder a swinging arm pivotfsupported .at one end 'from. said carriage, means for securing theobject to be grou'ndto said swinging arm, a guide plate,

- and a guide bearing, said guide-plate and be other with a stationmeans for yieldingly re'- late and guide bearing swinging arm and ary basepla te, and taming said guide in contact "Wlth eac in contact with the sur- 2. In a device of the described class, the

wheel, while by a 'regluldcnatel and in close proxiinit swin mg arm 'bearing being connected and with said other as" the object tociprocating carriage, .a swinging, arm p1votally supportedat one endfrom said car riage, means -for securing the object to be ground to said swinging arm, a guide plateand' guide bearing, said guide ,plate and bearing being connected one with said swingin .arm and the other with a stacombination of. a revoluble grinder, a 're- 3 tionary ase plate, a spring,connected at one end with said swlnging posite. end to said carriage, and means for communicating a reciprocating movement to said carriage and the cooperating parts mounted thereon. a

3. In'a device of the described class, the combination. of a revoluble grinder, a rearm and at its opcip'rocating carriage supported in close proximity to said grinder, aswinging arm pivotall'y supported at one end from said carriage, means for adjustably securing the "object to be ground to gsaid swinging arm, a guide plate secured to said movable carriage, a guide bearing supported from a stationary base plate,

.means for yieldingly retaining said guide plate and guide bearing in contact witheach other, and means for-communlcatmg a reclprocatmg movement to said'calrr age and the cooperating parts supported therefrom. 4. In a'device' of-the describedclass', the combination of a rinder, means for communicating a revoluble movement to said grinder, a carriage adapted to be altermoved in opposite directions past to .said grinder, a pivota y supported at one end om said carriage, means for securing the object to be ground to arm, a guide plate and a guide.- bearing, said guide ateand bearing being connected one with said swinging arm andthe other with a stationary base plate, means for yieldingly retaining said guide plate and guide hearing in contact with each other as theobject to be'gro'und-is moved incontact with the surface of said grinder, and means for said swinging manually communicating a reciprocating 

